If you manage things right, then your accounts shouldn't be on risk
(but of course, is still cheating and all transaction of this type could potencially put danger to your accounts, but there are ways to make things more safe and less suspicious on TNT's eyes)
There are several different ways to "secure" bought items or neopoints, some people like to get them on shells and let them sit there for a while, and then transfer neopoints by an auction, for example. I would suggest you to don't directly get them all at once, have different accounts for the porpouse and a different IP while entering them than the IP you currently use for your main or main permanent accounts.